Nondestructive diagnostics of charged particle beams in accelerators

The basic techniques for nondestructive diagnostics and detection of losses of charged particle beams used in accelerator engineering are reviewed. The data provided may help choose the systems for diagnostics and detection of losses of beams and give a qualitative picture of the operation principles of such devices. Quantitative characteristics that define the limits of applicability of each diagnostic technique are outlined.     

Suprathermal <Superscript>4</Superscript>He,O, and Fe ions at 1 AU in the quiet time of 2006–2012

The energy spectra of ⁴He, O, and Fe ions with energies of 0.04–2 MeV/nucleon, obtained by the ULEIS device on board the ACE satellite in the quiet time of 2006–2012, are analyzed. The obtained spectra of suprathermal ions from coronal holes were approximated by either a power function or a combination of a power and an exponential function. The approximation of 98 spectra yielded 2 < γ < 6, which could indicate different conditions in regions of particle acceleration in solar wind streams from coronal holes.     

Incorporation of Naphthalocyanine into Shells of Polyelectrolyte Capsules and Their Disruption under Laser Radiation

Different methods have been proposed for the incorporation of a dye, vanadyl tetra-5,14,23,32-phenyl-2,3-naphthalocyanine, into the shells of polyelectrolyte capsules. Capsule preparation conditions have been selected to provide efficient incorporation of the dye and stability of capsules to aggregation. A suspension of the capsules has been irradiated with lasers operating at wavelengths belonging to the near-infrared spectral region. It has been found that the capsules can be disrupted under the irradiation. Continuous and pulsed laser radiations have been shown to have different effects on the capsules.     

High-Current Electron-Beam Transport in the LIA-5 Linear Induction Accelerator

Physics of Particles and Nuclei Letters - The issue of high-current electron-beam transport in the LIA-5 accelerator is discussed. The results of numerical simulation of beam transport in the...     

Low-temperature internal friction of modified Ti50Ni42Co8 alloy

In this work we have investigated the internal friction of the alloy Ti₅₀Ni₄₂Co₈ with Hf (0.5–0.8 at. %) and Y (0.1 at. %) additives in the temperature range 4.2–293 K at frequencies of 200–600 Hz. We see two peaks on the temperature dependence of the internal friction for the alloy oxidized in an air atmosphere at 1100 K: the first peak at T=40 K is connected with movement of interphase boundaries during the thermoelastic phase transformation occurring according to the scheme B2 R B19'; and the second peak at 220–240 K is mainly connected with diffusion under the pressure of hydrogen adsorbed on the oxide particles. The hydrogen penetrates the alloy during sample preparation upon etching and electropolishing in acid solution. Support for the latter hypothesis comes from internal friction vs temperature data for the alloy hydrogen-charged at 1073 K in a gaseous atmosphere and then subjected to vacuum annealing at the same temperature, as well as the results of x-ray diffraction analysis.Voronezh Polytechnical Institute. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 12, pp. 14–20, December, 1992.     

Asymmetry of the magnetic tuning characteristics of molecular masers

Radiophysics and Quantum Electronics -